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If encountered to fix a Nokia C1-01 microphone problem, heres the solution that might possibly solved the problem. The Solution below shows the microphone module on the Nokia C1-01 PCB board that needs to check or replace if found damaged.

The MIC module is located and mounted at the bottom of the PCB board layout. near the antenna terminal contact pins.There are four components being mounted near to it and this are composed of filter coils and an ESD protection resistor or capacitors.

You may check the filter coils first, if the coils is open or already busted replaced it.
If the filter coils were okay  you proceed to replace the MIC module if found damaged.